Electric circulating heater



March 30, 1948. MacDONALD ET AL 2,438,670

ELECTRIC CIRCULATING HEATER Filed May 8, 1946 H TTa/EWEY Patented Mar.30, 1948 2,43 3,67 ELECTRIC CIRCULATING HEATER l'arry F. MacDonald andWilliam N. Askers, Spokane, Wash; said Askers assignor to H. F. Mac-Donild and J. C. MacDonald, both of Spokane,

Was

Application May 8, 1946, Serial No. 668,194 1 Claim. (Cl. 21938) veryefiectively heat air through theregisters.

Another object a heater consisting of mg part of the air duct.

Another object of the invention is to provide an air heater which issimple in construction and not liable to get out of order.

The invention is illustrated in the accompanying drawings wherein:

Fig. 1 is a sectional View showing a heater of the improved constructionmounted in position for use.

Fig. 2 is a top plan view of the heater.

Fig. 3 is a View taken along the line 3-3 of Figure 1.

Fig. 4 is a fragmentary view showing a portion of the heater inelevation.

Fig. 5 is a. wiring diagram.

This heater which is indicated in the numeral 1 is mounted in an elbowthrough an opening in a fioor cates with a hood 1 having gratings orregisters 8 at opposite sides so that when the dampers or shutters 9 areopened air may flow into rooms at opposite sides of the partition wallI0.

I is formed as shown in Figures 1 and 2 and includes in its constructiona multiplicity of tubes H which are disposed vertically and arranged ina block, the tubes having confronting side portions welded or otherwisesecured to each other. The dimensions of the block of tubes is such thatthe block fits into the casing 2 in spaced relation to walls thereof andrests upon brackets l2 carried by walls of the casing. Confronting sideportions of the tubes are formed with transversely extending openings l3which register as shown in Figure 4, and form aligned passages throughwhich are passed heating elements l4. These heating elements areelectrically energized and of conventional formation and are wired inseries so that when a circuit is closed the heating elements or unitswill heat the described the invention, what is against side wallsthereof above the inlet opening, a bank of vertically extending airtubes in said casing spaced from the walls and top of the HARRY F.MACDONALD. WILLIAM N. ASKERS.

REFERENCES CITED The following references are file of this patent:

UNITED STATES PATENTS of record in/the Number Name Date 1,701,096Bowling et al Feb. 5, 1929 1,888,497 Gasch Nov. 22, 1932 1,957,558 SiersMay 8, 1934

